Talk on WebAppsCamp. WoT.js is one of application framework based on node.js with open source hardware. It's a short introduction about WoT.js framework.

1. WoT.js
WoT App. Framework for Open Source Hardware
ETRI Protocol Engineering Center
Jonathan Jeon (hollobit@etri.re.kr)

2. 2
Open Source Hardware & DIY IoT

3. 3
Open Source Hardware & DIY IoT

4. 4
Q1: Web Technology for Small Connected Things ?
Half of connected devices will be small IoT devices
(how we can bring those devices into the web ecosystem)
We need to
consider
these small
devices

5. 5
Q2: How to make Simple WoT Architecture
Web
Resources
RESTful
Small
device
Small
device
What kind of request ?
What kind of response ?
Do we need to use HTML/CSS markup ?
which kind of web client do we need ?
Web Connectivity
Control purpose
(for automatize interaction)
Client/Server Client/Server

6. 6
WoT Application Framework for Open Source Hardware
Start
Target : Open Source Hardware
Goal : JavaScript based Simple WoT App Framework

7. 7
Open Source HardwareWoT Sensor/Actuator/Thing
WoT Application
Ethernet
WiFi
USB
WoT Application Framework
 Javascript based framework
 Device management
 Application lifecycle management
 Integrated Cloud service
 On device web portal server
 HTML5 based application
 AngularJS based powerful
web application
 Read & Write sensor device
Web Application
 Temperature
 Humidity
 Light
 Switch
 etc
Sensors
Sensor Gateway + Web Application
Conceptual Model
 WoT.js (= WoT Application Framework)
1-Wire
GPIO
UART
I2C
BLE

8. 8
Frameworks
WoT.js
= node.js : commonJS engine
+ express.js : Web server
+ sensor.js : sensor driver framework
+ angular.js : Web app framework

9. 9
Use Cases & Architecture Model
UA
Device
Sensors
Device
Device
Device
Server
Web
Resources
R2
R1
R3
R4
R5
R6
WoT.js
R7
UA: User Agent
R1~R6: Requirements
Int-1~Int-5: Interfaces
WOTR-1
WOTR-2
WOTR-3
WOTR-4
WOTR-5Event
Trigger
R8
Cloud

10. 10
Use Cases & Scenarios
 UA, Device
 UA, Device, Sensor
 UA, Device, Servers(…)
 UA, Device, Sensor, Servers(…)
 UA, Device, Sensor, Servers(…), Things
 Event, Device ….
 Event, Device …. User(UA)
 Sensor, Device, … User(UA)
 Things, Device, … User(UA)
 Servers(…), Device, … User(UA)

11. 11
Architectural Components
 Node.js based: support multiplatform and HW
 Sensor API: Easy sensing and accessing sensor H/W
 Middleware: support development of web application
Node Package Modules
Sensor APIs
Sensor drivers
dht11 gps Infrared
Actuator drivers
LED power on/off
Actuator APIsMiddleware
WoT Application Framework
WoT Applications
Sensor Data Transfer Protocol
(REST, MQTT, etc.)
Wireless Sensor Network
(Bluetooth, Zigbee, etc.)
WoT.js

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Pros. : Easy
 Any JS developer can be develop the WoT Application easily

13. 13
Pros: Standards
 WoT Transfer Protocol
 wottp://[{gateway}]/{sensor network}[:{bus id}]/{address}/{sensor model}/{sensor id}
• Example
 wottp:///w1/28-00000xxxxxx/ds18b20/28-00000xxxxxx
 wottp:///gpio/22/singleled/r222
 WoT Data Modeling
 Example
{
status: 'ok',
id: 'dht22-xxxxxx',
result: {
temperature: 26.9,
humidity: 51.5 } ,
time: 1377605409847 // optional
}

14. 14
Open Source Plan
 License Model
 MIT License (or extension)
 WoT.js web page
 Source/Community Management
 Github
 Distribution / Installation
 Using NPM install via NPMJS
 Governance model
 Open

15. Demo

16. 16
Web of Things Demo Scenario
BBB
BBB
BBB
WoT.js
Default
IoT Cloud Gateway
LCD
Temperature
Humidity
Ambient LightLED
Temperature
Ambient Light
Door Open
IP Camera
Switching
hub
Power
WiFi Dongle
BLE Dongle
BBB
WoT.js
Temp.
Humi.
WiFi Dongle
Power
Manager
BLE Sensor
Web of Things
WoT Web App
ETRI
Panel
Table

17. 17
JongHong Jeon (hollobit@etri.re.kr)
+82-42-860-5333
http://mobile2.tistory.com/m
http://twitter.com/hollobit